| Summary: | 碩士 === 國立中興大學 === 化學工程學系所 === 105 === In this study, three low bandgap conjugated polymers (PDPP, PDPCz21 and PDPCz11) consisting of 2-ethylhexyl functionalized diketopyrrolopyrrole as electron acceptor and terpyridine moiety containing carbazole as electron donor were synthesized and application for polymer solar cells (PSCs). Chemical structure of three polymers were characterized by the 1H-NMR and FTIR spectroscopies. The average molecular weights of the polymers were determined by the GPC. Good thermal stabilities were obtained for three polymers. The energy gap of the polymers was increased with increasing the content of carbazole derivative. In addition, LUMO energy levels of PDPP, PDPCz21, and PDPCz11were -3.99, -4.00, and -4.05 eV, respectively, while the HOMO energy levels were -5.44, -5.50, and -5.57 eV。Bulk heterojunction photovoltaic devices were fabricated with the structure of ITO/ PEDOT:PSS/ Polymer:PC71BM (1:1, 1:2 and 1:3 w/w)/Ca/Ag. The PSC fabricated from the blend of PDPCz21 and PC71BM (1:3, w/w) exhibited the short circuit current of 4.25 mA/cm2, the open circuit voltage of 0.37V, and the power conversion efficiency of 0.63% .
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